* draw pen skin lines and stamps to a framebuffer
* skip reading pixels and draw stamp to framebuffer
* update silhouette with readPixels
* draw pen canvas to buffer when its dirty
Composite lines and stamps on browser preferred side (cpu/gpu) until
the export texture is needed. Then blend the canvas with the current
buffer contents.
Updating this way invalidates useProgram optimization and the renderer
currently does not have a way to know this.
* draw lines on framebuffer through fragment shader
* optimize draw regions and pen skin matrix creation
* control draw regions
* mobile gpus need high precision floats for line drawing
* optimize cpu pen line math
* sampled pen line caps
* sampleless pen skin lines, lint, document pen skin buffer ops
* add PenSkin._canvasDirty to constructor
* remove DRAW_MODE_line
* comment PenSkin reused memory, use memory in drawRectangle
* turn draw region id's into optional method handlers
A region ID object may have an enter and exit method on it that are
used by default when entering and exiting that region.
* remove old DRAW_MODE_line precision setting
* standardize vert lines on 4 spaces
* fixup! turn draw region id's into optional method handlers
* do not draw when updating pen skin silhouette
* do not premultiply stamp colors by alpha
* fixup! do not draw when updating pen skin silhouette
* do not premultiply line color
* add a small rim around the line for aliasing
* variable pen line alias amount
* reverse offset pen line on y axis by relative alias amount
Reverse the offset to keep small line overlap to a minimum.
* fixup! reverse offset pen line on y axis by relative alias amount
* medium precision gpu floats
This will allow rendering the primary view, picking view, and "touching
color" view with different projection matrices without needing to
recalculate the model matrix for every Drawable every time.
This change introduces the Drawable class, which corresponds to a
Scratch sprite or clone. It supports setting its "skin" (corresponding
to a Scratch costume) by md5+extension, but currently only supports
bitmap skins. Drawables can be created, destroyed, and otherwise
manipulated by ID through the renderer.
